Complete the following text according to the option given below. (4 points)
Texto: WhatsApp, the enormously popular messaging and Voice over IP service owned by Facebook, allows users 1. ______ send text messages, voice calls, recorded voice messages, video calls, images, documents, and user location. More than 1 billion people 2. ______ 180 countries use WhatsApp to stay 3. ______ touch. What made it so popular, and why is it still popular? Most people think of WhatsApp as the first IM app to install 4. ______ their new smartphone.
- La estructura es allow + objeto + to + infinitivo: "allows users to send".
- Descarto at, on, in porque no introducen infinitivo de propósito.
d. to
- Con países y continentes se usa la preposición in: "people in 180 countries".
- at se usa con puntos concretos, on con superficies, over con movimiento por encima.
a. in
- La colocación fija es stay in touch (mantenerse en contacto).
- Es una expresión idiomática que no admite otra preposición.
d. in
- Se instala una app en el teléfono: install ... on their new smartphone.
- in se usaría para instalar dentro de un espacio cerrado, no para un dispositivo.
c. on








